Method of and apparatus for stereoscopic recomposing and measuring



r J 9 1 .L Y. a t MLH E e m E D N 5 e WN R 3 mm M 0 O 3 M w 2 MW WME A, m .2 NH S W N M L 0 m 6 M mm mu w a B |I1| M w w h N o A E f M LRG W Am my USM H3 R LS I m 0mm ,IJ Pm 2 M m w m OR D MW 0 m J M PARTICLE ACCELERATOR April 21, 1953 Filed March 8. 1949 A ril 21, 1953 Filed March 8. 1949 M. POWELL ET AL METHOD OF AND APPARATUS FOR STEREOSCOPIC RECOMPOSING AND MEASURING a o o Q a 1 x 0 .u H H l o o @I) 6 Sheets-Sheet 2 INVENTORS,

W/LJON M. POWELL Hf/PMAN PA UL HERNANDEZ, Jr:

April 21, 1953 w. M. POWELL ET AL METHOD OF AND APPARATUS FOR STEREOSCOPIC RECOMPOSING AND MEASURING 6 Sheets-Sheet 3 Filed March 8. 1949 IN V EN TOR S. MLJON M POWELL HERMAN PAUL HERNANDEZ, Jr:

A TTORNE X April 21, 1953 w. M. POWELL ET AL 2,635,339

METHOD OF AND APPARATUS FOR STEREOSCOPIC RECOMPOSING AND MEASURING Filed March 8. 1949 6 Sheets-Sheet 4 WILSON M. POWELL 1|m |m| G INVENTORS.

HERMAN PAUL HERNANDEZ /I.

A TTORNEY April 21, 1953 w. M. POWELL ET AL 2,635,339

METHOD OF AND APPARATUS FOR STEREOSCOPIC RECOMPOSING AND MEASURING 6 Sheets-Sheet 5 Filed March 8, 1949 INVENTORS. W/LJON M POWELL. HERMAN PAUL HERNA NDEZ, J1: BY

A TTORNE).

April 21, 1953 w. M. POWELL ET AL 2,635,339

METHOD OF AND APPARATUS FOR STEREOSCOPIC RECOMPOSING AND MEASURING Filed March 8. 1949 6 Sheets-Sheet 6 INVENTORS. Mud/v M POWELL HERMAN PAUL HERNA N0z,J/: BY

,4 TTORNE).

Patented Apr. 21, 1953 UNITED STATES PATENT OFFICE METHOD OF AND APPARATUS FOR STEREO- SCOPIC RECOMPO SING AND MEASURING sion Application March 8, 1949, Serial No. 80,304

13 Claims.

This invention relates to a new and improved a opair taken by conventional camera means and showing the phenomena occurring in a conventional cloud chamber. It also further relates to a new and improved method of and apparatus for measuring ion paths.

In recent years a great amount of knowledge of nuclear phenomena has been derived from Study of the behavior of ions in cloud chambers. The degree to which the use of this apparatus can be extended, however, is largely dependent upon the speed and accuracy with which the asso ciated photographic and reproduction equipment can be employed. In particular, the visual reproduction in full scale size of the precise path in three-dimensional space of an ion under observation is most important, especially when it is desired to make a rapid, direct measurement of that path. Such an observation may desirably involve not only the identification of a charged ion, such a proton, deuteron, meson, alpha particle, beta particle, or the like, or the nature of its path, such as its radius of curvature, angle of departure, length of path, or thickness of path, but also may involve the behavior of numbers of ions involved in certain nuclear reactions such as occurs in scattering. As a consequence, even though adequate photographic records, such as stereopairs, can usually be produced in connection with cloud chamber operations, the value of such records is in the last analysis dependent upon the accuracy and ease withwhich they can be recomposed in their proper relation for study. This study heretofore has frequently entailed a tedious and slow procedure in recomposing the image, involving in some cases, difiicult, awkward and eye-straining manipulations of the stereo-- pairs. It therefore is an object of the present invention to provide a new and improved apparatus for recomposing stereopairs and for overcoming limitations found in conventional stereoscopic reproducing equipment. l

Another object is to provide a method for reproducing in three dimensional space a visual image of a photographed path of a particle which is identical insize and relative location to such path at theinstant it was photographed.

Another object is to provide a method and means for directly measuring in full scale the path of a particle passing through three-dimension-al space.

Another object is to provide a new and improved combination of method and apparatus for the recording, under a given set of optical conditions, of a full size visual image of the path of a particle in space and the recomposing in full size of the image under a substantially identical set of optical conditions.

A further object is to provide a compact and rugged apparatus for measuring in three dimensions the path of a particle passing through three-dimensional space.

A further object is to provide a new and improved means for quickly adjusting lens and film in a stereoscopic projector.

A still further object is to provide a new and improved viewing and measuring screen for a stereoscopic projector.

Stillanother object is to provide an improved mounting for the measuring screen of a stereoscopic projector.

Qther objects and advantages of the invention will become more apparent as the description proceeds when considered in conjunction with the accompanying drawings, in which:

Figure l is a schematic view showing one arrangement of apparatus for making a photographic record of phenomena occurring in a cloud chamber;

Fig. 2 is a diagrammatic view illustrating the relationship of apparatus employed in recomposing the photographic record taken by the apparatus of Fig. 1;

Fig. 3 is a plan view of stereoscopic apparatus suitable for carrying out the invention;

Fig. 4 is a side elevation of the apparatus shown in Fig. 3 with portions shown in section and with the measuring screen at a location corresponding to a full size image reference point;

Fig. 5 is a plan view, partly in section, showing the general arrangement of the stereoscopic projector apparatus;

Fig. 6 is a side elevation, partly in section, of one of the projectors shown in Fig. 5, taken along line 6-6 of Fig. 5;

Fig. 7 is an end elevation, partly in section, taken along line 1-7 of Fig; 6;

Fig. 8 is a detail view, in side elevation, of the lens adjusting means shown in Fig. 7

Fig. 9 is a detail view of the lamp gimbal taken along line 9-9 of Fig. 6; and

Fig. 10 is a plan view of one form of template and bottom surfaces 9 and 10 respectively, said 3 chamber being mounted in the field of cooperating magnets II and I2 and receiving from any suitable particles accelerator l3 charged particles whose behavior it is desired to study. The customary expansible chamber and heat exchanger means indicated diagrammatically at M in cooperation with the cloud chamber may be coordinated in any suitable manner with the stereoscopic camera lens l5 and it. to the end that a stereopair may be produced. at an appro priate instant. As is customary; the upper surface 9 of the chamber may comprise a glass member bearing suitable reference markings and the lower surface it! may comprise a suite: able member preferably covered with; a" light absorbing material. In certain constructions wherein the expansible chamber is; located be neath the main chamber body this surface may take the form of a black velvet screen It is to be noted that in order to utilize the present invention most effectively a substantial duplicationlof thei geometry. and the; optical; conditions obtaining at the instantv the stereopair is produced must be providedat the time when such pair is; recomposed forstudy. As a consequence the: distance a between the centers of. lens hi and E5, the distance 11 through the medium of air. betweensuch lensand the upper glass surface sofa. the cloud. chamber 8:, and the. quality and thickness of: such glass are closely duplicated in the projector apparatus later tobe described. As will further be; noted,v full scale reference lines or' other datagsuch as the marks [02 shown on the surface of a screen I1 5, preferably are etched or otherwise incorporated in the surface having a glass top optically equivalent to the upper glass surface 9- of. the cloud chamber. Positioned upon. table: 20. is: a movable support I66; carrying thereon the improved viewing; and:

measuring screen I75 later to be described in detail: Such screen normally. is positioned at: a standarddistancee abovethe surface of: table 2 ii; at: the beginning; of any: measuring. operations. Interposed between a projector lens is and the bottomvof: table and. at distances c and d respectively therefrom is'a suitable reflecting means 36.. As: a result of this. combination of apparatus it will be noted that. a ray oflight passing through a projector lens 13 travels through air a. distance substantially equal to the sum of c, dv and-.ewhichin turn isequal. to the distance. I) traveled by a ray of light which produced. thephotographic record. It will further be noted that the respective rays likewise have traveled through the same distance of optically equivalent glass, in onecase. through the glass table.

top-20; in the other case through the glass top surface of cloud chamber. 8. Although air: and glass are mentioned asbeing the mediums through which suchrays travel,.,theinvention in no way isintendedto be limited thereto andin its broader aspects may be employed using other gaseous; solid or liquid-. mediums;

Passing now to Figs. 3 and 4, showing a preferred form of apparatus used in our invention, it will be noted that a rigid framework is provided comprising a base member 2|, pairs of rigid. uprights: 22, 23* and 24 and: a pair of horizontally disposed guide. tracks 25 Adapted for sliding movement along said tracks is a base plate 26 upon which is mounted the stereoscopic projecting means employed in reproducing the stereopairs for study. The position of plate 26 on't'racks 2'5may' be selectively adjusted and the plate retained in aiselected position by means of a bracket Hi1 depending from the plate and engagingi athreadedi rod H18. This rod may be mounted? for rotation in supports affixed to tracks 25 and may be actuated by means of a crankiili. Asuitable table top frame 2? mounted upon uprights 22 and 23 and ba ing an overhanging portion 29 may also be provided for retaining the transparent glass table top 21 in the desired. location and for. furnishinga. convenientsupport to measuring apparatus cooperatingztherewith. By means'of arigid cross member 29- extendingbetween uprights 22 andZS- the reflector 3il-is-retained in aposition for reflecting light rays from the projecting apparatus upwardly through the glass 20. Reflector sumay beformedof any suitable material, suchas glass It is to.

are thus. maintained.

Any suitable-housing or lightshielding means, not shown, may. be arranged around" the up,

rights. 22. and 231' in. order to prevent dust, moisture or. light from extraneous sources from entering the. space beneath table top 25?. In cere tain cases: this purpose can easily be accom. pl'ished by use of heavy, dark cloth screens such as are frequently employed in photographic work.

Referring now to the. projecting. means, it will be noted that. aseparately mounted and adjustable projector group is provided for eachv mem: ber. of the. stere'opair. As shown in Fig. 5;.fan shaped supportplates 4B and.4l are commonly mountedwith suitable antiefriction bearings upon a. bearing post. 42 located centrally of. base plate. 26. Adjacent the outer extremity of support plate. 40}. shown. in Fi'gnfi, awbearing housing-l3 carrying. lower, bear-ing rolls 44 and 45' and upp rbearing, rolls 46v and 41. mounted respectively upon pivoted arms 48 and 49 serves to provide a substantially frictionless mounting. for the support plate 40. and'the load which it bears. A suite.

able tension spring 50' extending between the upper extremities. of arms48 and t9 exerts pressuretokeep'the'plate iil from rocking and a suitableshieldi'l serves-to partially enclose the bear.- ing; housing.- Extending from an, outer edge of support plate-40 is an. upstanding web 52 provid me aconvenient meansfor rotating-the plate 40' about its pivot onpost 42. For efiecting this rotation a rotatable screw threaded pin 53 mount.- ed a: stationary framea54 afiixed to base plate 28 is turnedima-nual-ly or otherwise, as by means of aknob 55; For holding support plate 40 in a de-'- sired adjusted position acooperating pin 5$bearing upon the: oppositeside of web 52 and pushed outwardly by compression spring 5'! mounted in housing 58 is='provided.

Asbestshown in Fig. 5, a similar apparatus forefiecting the desired movement of supportplate 4| may be employed whereby a web 62 attached tosaid plate is actuated by a screw threaded member 63 housed in a stationary frame 64 affixed to base plate 26. For adjusting member 63 a manually operable knurledknob 65 may be used. Similarly, a spring pressed pin 66 contained in housing 68 may be provided to hold support plate 4| in the desired adjusted position.

Referring now to Fig. 7 it will be seen that rigid supports 19 and H affixed at their lower ends to plate provide a mounting for a suitable hollow, box-like holder 12 in which a lensassembly 13, later to be described, is adjustably mounted for limited rotation. The holder 12 in turn is trunnioned as at 14 and 15 in the respective supports for adjustment in a generally vertical plane. Depending from the lower surface of the holder 12 is an arm 16 rigidly affixed to the holder and serving as a means for tilting the holder and its attached parts. Mounted upon a framework 11 secured to support 1| is a housing 13, within which a screw threaded pin 19, actuated in any suitable manner as by means of knob 80 is adapted to turn and to bear upon arm 16. For holding the arm in the desired adjusted position a second pin 8| bearing upon the opposite side of arm 16 and resiliently positioned in a second housing 82 which in turn is secured to framework 11 may be provided.

-:The lens assembly 13 may comprise a hollow tubular portion mounted at one end in a rotatable collar 69 forming the forward end of holder 12. An arm 83 rigidly fixed to the collar serves as a convenient means for rotating the entire lens assembly. As will later become apparent a lens system (not shown) is mounted in the outer section of the hollow tubular portion. By movement of any suitable means, such as a knob 84, a screw threaded pin 85 mounted in a housing 86 attached to theupper part of holder 12 functions to rotate the lens assembly counterclockwise as shown in Fig. '7. Bearing upon the opposite side of arm 63 As will thus be noted, the lens assembly 13 is therefore cap-able of adjusted movement in any of three planes whereby it may be coordinated with the setting of its companion lens assembly I33, later to be described.

1 For the purpose of holding in a prescribed position within holder 12 the record to be projected through the lens assembly, asfor example a selected picture on an elongated film 99 such as shown in, Figs. 3 and 5, various means may be employed. One such means may comprise a fiat transparent plate 9I aflixed to the rear of holder 12 and against which the front surface of the film closely fits. In order to provide for ease of positioning and holding the film a resiliently mounted apertured backing frame 92 having a glass partition 93 thereon adapted to bear against the rear surface of the film may be used. Springs 94 not only provide a pivoted resilient mounting for frame 92 but also serve-to hold partition 93 against the film without damage to such film. For the purpose of permitting ready adjustment of the film a depending extension 95 on frame 92 may be engaged with a lever arm 96 pivotally mounted at 91 upon the side of holder 12 and tilted against the action of springs 94. A conventional thumbscrew 98 bears upon one side of lever 96 for effecting the desired movement of thebacking frame.

One convenient arrangement for compactly, assembling the holder 12 and its associated 5131110".

ture generally as a unit may employ a cantilever support H0 fastened at one end to thelower. portion of the lens holder 12 and, movable as aunit therewith. It will be understood, however, that such associated structure may be mounted separately and adjustably upon base plate 26 without departing from our invention. The support H0 may mount adjacent the film 99 a condenser lens assembly indicated at III and comprising one or more lenses whose function is to focus upon said film a beam of light. Located adjacent the free end of support H0 is an adjustable gimbal structure having a bracket H2 afiixed thereto. A second bracket I I3 is mounted for turning movement about pivot points I I I and H5 in bracket H2. Mounted upon bracket H3 for turning movement about a .pivot H6 is a clamp H1 adapted to hold securely a lamp 31S?- sembly generally indicated at H3. It will be understood that any suitable lamp with necessary. connections to an electrical circuit and' switches therefor will be fitted into assembly I I8, but since the precise nature of the same forms no essential part of the invention it is not shown herein. As best shown in Fig. 5, a suitable arm H9 fastened to bracket H2 cooperates with. a.

second arm I29 fastened to bracket H3 through.

the intermediary of a threaded thumbscrew 'I2I engaging both said arms to provide for tilting of the gimbal in a vertical plane about pivots H4 and H5. ment an arm I22 affixed to bracket H3 cooperates with a second arm I23 amxed to clamp I I1 through the intermediary of a second threaded thumbscrew I24 engaging both arms to provide for rotation of the clamp and its associated lamp assembly about pivot point H6. As will now be apparent, the invention thus provides upon the adjustable base plate 26 an arrangement whereby one grouping of the projector assembly mounted in turn upon the adjustable plate 40 can be moved to a desired general projecting di-. rection. In addition, the movable holder 12 carrice with it an individual projector combination for that grouping which is mounted upon .the.

support H0 and the projecting lightmeans associated therewith moreover is capable .ofindependent adjustment in two planes.

Having thus disclosed the preferred construction of one grouping of the projector assembly, reference is made to Fig. 5 showing the complementary grouping of the assembly mounted upon support plate II and comprising a hollow, box-like holder I30 pivotally mounted upon rigid supports I3I and I32 attached to said plate. A suitable lens assembly I33 may be fitted within one end of said holder by means of collar I31 and a flat transparent plate I34 against which the front surface of film 99 fits may be attached at the other end of the holder. provide for ease of positioning the film an apertured backing frame I35 containing a glass par tition I36 bearing against the rear surface of the film may also be used, the construction and operation of which is similar to that of frame 92 and its associated parts. Since the grouping mounted upon plate ll is intended to be the initial grouping to be adjusted in the operation of the apparatus and the grouping mounted upon plate 40 is later referred to as said initial grouping; no additional means for rotating the holder I30 in a horizontal plane is provided nor is any means for rotating the lens assembly I33 within By a somewhat similar arrange-.

In order to 1 -purpose of centering the same in the respective lens holders, can be made at any time merely by operating the backing frames 92 and I35 to secure the proper spacing of the respective units of the stereopair. With the above reference positions of the superimposed images thus established upon thescreen, it probably will be found in the cases in which the stereopair shows an ion path, that the paths shown by the two images are separated throughout their length. In this event screen 115 is then raised upon post I67 to a distance at which the two images coincide at one point, preferably in the direction from which the ion beam actually entered the cloud chamber. It will be observed that the actual distance through which said screen is so raised is an actualmeasurement of the distance within the cloud chamber below its top surface 9 at which the observed phenomenon actually occurred. Having thus determined the true focused location of one point of both images, the cross hairs I03 of screen I15 are then brought to bear upon this point by movement of base unit IBBupon table top 26, and the screen is then rotated upon protractor A64 to a position at which one cross-hair substantially bisects the angle between the diverging images. Thereupon screen I15 is tilted'about shaft ill until the two images are recomposed into a single image along their entire length. This recomposed image is neither foreshortened nor attenuated but represents an actual view in full scale size of the phenomenon which was photographed. When a measurement rather than a mere observation of this image is desired, it may be secured merely by laying a suitable template I08, such as shown in Fig. 10, over the screen H5 and a direct measurement can then be taken of the length, direction, or'width of ion path. Template Illll may conveniently contain reference data lines In! showing radii of curvatures, lengths of paths, thicknesses of paths,

or other criteria which it is desired to measure directly. It will be noted that in addition to the fact that the distance through which screen H5 was raised'measures a distance downwardly in the cloud chamber, the measurement of the angle on protractor 115 indicates the angle at which a path extends downwardly or upwardly within such chamber, the measurement of the angle on protractor I64 indicates the angle at which a path extends sideways from the direction of the ion beam, and the length of the recomposed path is 'a true reproduction in full scale size of the actual path taken in the three-dimensional space in the cloud chamber. 7 H H The sequence of operations of the apparatus abovedescribed may be varied if desired without departing from the invention, so long as the conditions of duplicate geometry are observed, and it is not to be inferred that other sequences of operations are excluded.

strain, especially when the observer was com- 10 pelled to study the data under physically awkward postures, may now be avoided.

Having thus described our invention, it will be apparent that numerous modifications may be made within the scope and intent thereof, and we do not limit the invention to the exact details shown herein except as they may be defined in the'following claims.

What is claimed is:

1. In a stereoscopic image-recomposing apparatus, a stereopair, first and second projector groupings reproducing first and second images from said stereopair under optical conditions substantially identical with the optical conditions under which the stereopair was produced, a planar screen upon which said images are recomposed into a full size single image, a vertical extensible post'supporting said screen for movement therealong in a vertical plane, a base member freely movable about a plane transverse to the direction of projection of said images and holding said post, and a shaft journalled in'the extensible portion of said post and supporting the screen for rotational movement transversely of said post whereby the plane of the screen maybe positioned in three-dimensional space and the recomposed image may be focused thereon in the true size.

2. A stereoscopic image-recomposing apparatus including, a stereopair, first and second projector groupings, adjusting means connected to said groupings for positioning the same in order to reproduce first and second images from said stereopair under optical conditions substantially identical with the optical conditions under which the stereopair was produced, a planar screen upon which said images are recomposed into a full size single image, a transparent table top through which said images are projected, a pantograph assembly affixed to said table top and movable in a substantially horizontal plane, a base member rotatably connected to the free end of said pantograph and supported upon said table, a vertical post positioned upon said base member, avertically movable member mounted upon said post, a transverse shaft journalled in said member and adapted to support said screen, and means for retaining said screen in a selected tilted position with respect to said vertical post, whereby the plane of such screen may be positioned in threedimensional space and the recomposed image may be focused thereon in its true size.

3. A stereoscopic image-'recomposing apparatus including, a stereopair, first and second projector groupings, adjusting means connected to said groupings for positioning the same in. a

' horizontal plane in order to reproduce converging first and second images from said stereopair under optical conditions substantially identical with the optical conditions underwhich the stereopair wasproduced, a reflector directing. said images in a vertical direction, a transparent horizontally arranged table top through which said converging images are reflected, a planar screen upon which said images are recomposed into a full size single image, a pantograph assembly afiixed to said table top and movable in .a substantially horizontal "plane, a base member rotatablyconnected to the free end of said pantograph and supported upon said table top, a vertical post positioned upon the base member, a verticallym'ovable member mounted upon. said post, a transverse shaft journalled in said member and adapted to support said screen, and means for retaining said screen in a selected tilted ll position with respect" to said vertical :post whereby the plane of such screen :may "be apositioned in three-dimensional space and the 'retcomposed image may be focused thereon in its .true TSlZG.

4. EIEh'e method of I stereoscopicallyrecomposing :upon arscreen aziull scale'ima'ge of :stereoscopi- .ca'lly iphoto'graphed paths rof tions traveling aangularly with respect to theiplane-rof1thefl1mof a stereoscopic camera, comprising producing a ifilm stereopair of such paths :of :ions under a given :set of optical conditions, .stereoscopically aprojectin'g overlapping :images of said 'stereopair (upon rarscreen :disposed: transversely :of :the direciion :of projection and under :cptical conditions identical with :the first-:mentioned optical conditions, and rotating said screen :from :such transwerse :postion :until ;the :images are completely superimposed and thereby shown in .iull scale.

:5. "Thelmethod 10f r-stereoscopically recomposing ,an image ,upon a screen comprising -projecting light simultaneously through a film 'stereopair containing images of theipaths of ions traveling sangularly with respect to ,the plane of :such -film, forming two :separate and-converging *views :01 such images upon a :screen disposed transversely of the direction of'proje'ction with at least :one pointiof the first image superimposed upon the identical point of the other image, and rotating said screen (about an (axis containing :saidsuperimposed *points "until :the remainder of one ,of

said aziewsis-superimposed uponzthe other on said .6. The method; of stereoscopically recomposing a full-scale .ima ge upon a screen .-movable in three-dimensional space zcomprising projecting light simultaneously through a film stereopair rcontaining zimages of an lobject extending an- ;gul-arly with respect to :the plane of such iilm and forming two separate views -,of :the object, ifocusing said views upon a screen held in an ;initial;position transverse :totthe direction of projection, :adjusting the position of said .screen .along the :direction of projection until .at least one point :of one View is superimposed .on the same point of the other 1 view, and rotating said :screen about an axis containing said superimposed points :until the remainder of one of said iviews :is superimposed upon the rather on said screen.

' '7. 'ilhe imethodrof stereoscopically recomposing :a .ifullescale .-image upon a screen imovable in three-dimensional :space comprising projecting light simultaneously :through a film :stereopair containing images :of :an object extending :anzgularly with respect to the ;plane of .such :film and forming Ytworseparateand converging views rofithe images,:=refiecting-said separate views upon ;a screen .held in an initial position transverse to the direction of reflection, :moving the screen along vthe path sof :refiection until .at least cone point ro'f :on'e *viewis superimposediuponzthe :same point :of the :other view, and rotating 'saidsscreen about :an :axis containing .isaid superimposed .poin'ts until :thexremainder of one of said views ;is superimposed upon the :other :on .-'said ISCI'BBII.

1'8. "Thexm'ethod iof stereoscopically:recomposing "upon .a screen .aJ-fuII-JScaIe image taken under :a :givenaset aof cpticalaconditions comprising projecting light-simultaneously througha filmistereopair containingim'agesof a path of ions travel- :ing through a cloud chamber :at :an angle with respect "to the'fplane iofisaidtfilm andpforming two separate and converging views of "said image, :focusing 'said views upon a screen :held .in an meanest jeictl'on, reproducing the original :set 1o! roptical finitizfltposition transverse to the direction of pro- .215

:conditions :by adjustment of the 'distanceioi ssai'd FSCIEEBII from said :stere'opair along :the :direction "of,tproj'ection, adjusting the :DDSlfiOl'liOffSBll'd ,views "until :at 'least one point of :one view :is superimmosed :upon the same :point of the other view, iandrro'tating said :screen'about ,an axis containing :said "superimposed ,points :until the remainder of none of:said wiews issuperimposed'upon the-othe son said :screen.

19. fI-hemethod-of stereoscopically*recomposing upon a :screemaifull-scale. image comprising producing a rfilm stereopair 'of the paths :of .ions

traveling angularly with respect to the planeof :the rfilm of :a stereoscopic camera through :a cloud chamber and under -:a given set of optical conditions, projectingilight through-a first member of :said .stereopair and directing the image a pon sa5screen:disposed transverselyof .the direc- :tion of projection, reproducing the original ,set

of optical conditions for the image of said first :member by -a selective "adjustment of the disitancebetweencsaid screen:andifirst member along :the direction of projection, :projecting .light through thesecondrmember .of the .stereopairtand separately adjusting "the ,:focus of said second member in order :to direct :the separate views of the-image of'the-two members upon thescreen with at :least one point of one @view superimposed upon :the same ,point-of the other -view, fanderotating :said screen about :an axis containing asaid superimposed 'ypoints until the remainder riof 'one of :said views is superimposed'zupon the -,other on said-screen. 7

10. A stereoscopic zimage-recomposing appara- :tus having in :combinatiomastereopair containsing :two spaced-apart images, a Efirst projector, -a

second projector, each projector being adapted independently to project :a single image-10f ith'e ,sterecpair, 1a reflector :against which .:the pro- ,j-ected ,images are directed, a ,planar screen adjustable along three dimensions and rotatable in three-dimensional :space in the :path ,of the images from :saidrefiector, and ta transparentzt'op itable disposed :between :said -;reflector and screen, :said screen beingesupported :onsaid table .and adjustable with respect thereto byJ-meanspf ran :-e1eva.ting structure, whereby the ireflected image from one projector .may rbe superimposed at the surface of the :screen -rupon the -.rellecte"d image atrom the i other proj ector :and'focusedumi- :formly at all ggportions of the image.

.11. LA stereoscopic 'image-recomposing apparatus having in combination, a stereopair containing two spaced-apart images, a :first projector, a second projector, each projector Joeingadapted independently ;to project a single image of the rstereopair, areflector. against whichitheprojected imagesrare directed, a planar screen adjustable along three -dimensions and rotatable in .threedimensional space .in the path of the images from said reflector, and .a transparent-stop table disposed between said reflector and screen, said screen being supported on said table with ad- 'ju's'table means provided for rotating the screen -horizontally with respect to "said'tabl'e, whereby the reflected image from one projector may be superimposed at the surface of the screen-upon 'the reflected image from the other proj ector "and focused -uniformly 'at all portions of the image.

3L2. A stereoscopic image recomposing:apparatus Lhaving "combination, :a Lstereopair containing :two ispaced-eapart images, a first projector, :a second 'proj ector, each :proj ector ibeing adapted mdependently 'tto project :a single image of the from said reflector, and a transparent-top table disposed between said reflector and screen, said screen being supported upon said table and provided with an elevator means for adjusting the screen vertically with respect to said table, with means supported upon said table for rotating the screen horizontally with respect to said table, and with means attached to said elevator means for rotation of the screen about an established vertical setting thereof, whereby the reflected image from one projector may be superimposed at the surface of the screen upon the reflected image from the other projector and focused uniformly at all portions of the image.

13. In a stereoscopic image-recomposing apparatus, a stereopair, first and second projector groupings reproducing first and second images from said stereopair under optical conditions substantially identical with the optical conditions under which the stereopair was produced, a calibrated base member freely movable about a plane transverse to the direction of projection of said images, a calibrated and extensible post mounted vertically upon said base, a shaft rotatably journaled in the extensible portion of said post and extended transversely therefrom, and a planar screen supported by said shaft whereby the plane of the screen may be adjusted in threedimensional space and a recomposed single image may be focused thereon in true dimensions. WILSON M. POWELL. HERMAN PAUL HERNANDEZ, JR.

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